./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const_m3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const_m3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash bd654f01b412711828f8177df5f8f7c2933e3d7436939e6c61fdcced19c9515c --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:18:02,654 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:18:02,657 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:18:02,725 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:18:02,726 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:18:02,728 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:18:02,730 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:18:02,733 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:18:02,736 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:18:02,737 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:18:02,739 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:18:02,741 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:18:02,741 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:18:02,743 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:18:02,745 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:18:02,747 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:18:02,749 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:18:02,750 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:18:02,753 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:18:02,756 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:18:02,759 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:18:02,761 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:18:02,763 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:18:02,764 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:18:02,769 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:18:02,770 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:18:02,770 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:18:02,772 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:18:02,772 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:18:02,774 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:18:02,774 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:18:02,776 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:18:02,777 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:18:02,778 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:18:02,780 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:18:02,780 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:18:02,781 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:18:02,782 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:18:02,783 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:18:02,784 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:18:02,785 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:18:02,786 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:18:02,815 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:18:02,816 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:18:02,817 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:18:02,817 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:18:02,818 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:18:02,819 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:18:02,819 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:18:02,820 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:18:02,820 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:18:02,821 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:18:02,821 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:18:02,821 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:18:02,822 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:18:02,822 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:18:02,823 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:18:02,823 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:18:02,824 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:18:02,824 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:18:02,825 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:18:02,826 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:18:02,826 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:18:02,827 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:18:02,827 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:18:02,827 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:18:02,828 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:18:02,828 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:18:02,828 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:18:02,829 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:18:02,829 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:18:02,829 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:18:02,829 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:18:02,830 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:18:02,830 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:18:02,830 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:18:02,831 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:18:02,831 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:18:02,831 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:18:02,831 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:18:02,832 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:18:02,832 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:18:02,832 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:18:02,832 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bd654f01b412711828f8177df5f8f7c2933e3d7436939e6c61fdcced19c9515c [2021-11-23 02:18:03,131 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:18:03,158 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:18:03,161 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:18:03,162 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:18:03,163 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:18:03,165 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-crafted/zero_sum_const_m3.c [2021-11-23 02:18:03,238 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/data/bc53a8313/eb6ea76c3896427c8367786f514f7a39/FLAG8ac8eeaac [2021-11-23 02:18:03,806 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:18:03,806 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c [2021-11-23 02:18:03,814 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/data/bc53a8313/eb6ea76c3896427c8367786f514f7a39/FLAG8ac8eeaac [2021-11-23 02:18:04,181 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/data/bc53a8313/eb6ea76c3896427c8367786f514f7a39 [2021-11-23 02:18:04,186 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:18:04,190 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:18:04,194 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:18:04,194 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:18:04,198 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:18:04,199 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,207 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3dea56d0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04, skipping insertion in model container [2021-11-23 02:18:04,208 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,235 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:18:04,254 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:18:04,452 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c[408,421] [2021-11-23 02:18:04,505 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:18:04,514 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:18:04,527 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/sv-benchmarks/c/array-crafted/zero_sum_const_m3.c[408,421] [2021-11-23 02:18:04,537 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:18:04,552 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:18:04,553 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04 WrapperNode [2021-11-23 02:18:04,553 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:18:04,554 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:18:04,555 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:18:04,555 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:18:04,564 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,573 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,597 INFO L137 Inliner]: procedures = 16, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 104 [2021-11-23 02:18:04,598 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:18:04,598 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:18:04,599 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:18:04,599 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:18:04,609 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,609 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,612 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,612 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,619 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,625 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,626 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,629 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:18:04,630 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:18:04,630 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:18:04,630 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:18:04,632 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04" (1/1) ... [2021-11-23 02:18:04,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:18:04,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:04,709 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:18:04,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:18:04,780 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:18:04,780 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:18:04,780 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:18:04,781 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:18:04,781 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:18:04,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:18:04,781 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:18:04,877 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:18:04,878 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:18:05,098 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:18:05,170 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:18:05,171 INFO L301 CfgBuilder]: Removed 7 assume(true) statements. [2021-11-23 02:18:05,173 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:18:05 BoogieIcfgContainer [2021-11-23 02:18:05,174 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:18:05,178 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:18:05,178 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:18:05,187 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:18:05,188 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:18:04" (1/3) ... [2021-11-23 02:18:05,189 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d618772 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:18:05, skipping insertion in model container [2021-11-23 02:18:05,189 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:18:04" (2/3) ... [2021-11-23 02:18:05,189 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d618772 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:18:05, skipping insertion in model container [2021-11-23 02:18:05,190 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:18:05" (3/3) ... [2021-11-23 02:18:05,191 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m3.c [2021-11-23 02:18:05,210 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:18:05,222 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:18:05,294 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:18:05,304 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:18:05,304 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:18:05,322 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:05,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 02:18:05,329 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:05,330 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:05,331 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:05,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:05,338 INFO L85 PathProgramCache]: Analyzing trace with hash 245696831, now seen corresponding path program 1 times [2021-11-23 02:18:05,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:05,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734216745] [2021-11-23 02:18:05,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:05,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:05,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:05,655 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:18:05,656 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:05,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734216745] [2021-11-23 02:18:05,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734216745] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:05,660 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:18:05,661 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:18:05,663 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545713741] [2021-11-23 02:18:05,665 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:05,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:18:05,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:05,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:18:05,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:18:05,722 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:05,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:05,825 INFO L93 Difference]: Finished difference Result 28 states and 43 transitions. [2021-11-23 02:18:05,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:18:05,829 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-23 02:18:05,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:05,839 INFO L225 Difference]: With dead ends: 28 [2021-11-23 02:18:05,839 INFO L226 Difference]: Without dead ends: 13 [2021-11-23 02:18:05,844 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:18:05,849 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:05,852 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:18:05,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-23 02:18:05,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-23 02:18:05,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:05,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 19 transitions. [2021-11-23 02:18:05,971 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 19 transitions. Word has length 11 [2021-11-23 02:18:05,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:05,972 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 19 transitions. [2021-11-23 02:18:05,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:05,974 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 19 transitions. [2021-11-23 02:18:05,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 02:18:05,975 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:05,976 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:05,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:18:05,977 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:05,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:05,982 INFO L85 PathProgramCache]: Analyzing trace with hash 1556405487, now seen corresponding path program 1 times [2021-11-23 02:18:05,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:05,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360893750] [2021-11-23 02:18:05,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:05,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:06,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:06,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:18:06,116 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:06,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360893750] [2021-11-23 02:18:06,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360893750] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:18:06,118 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:18:06,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:18:06,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104646263] [2021-11-23 02:18:06,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:18:06,121 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:18:06,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:06,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:18:06,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:18:06,125 INFO L87 Difference]: Start difference. First operand 13 states and 19 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:06,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:06,242 INFO L93 Difference]: Finished difference Result 27 states and 43 transitions. [2021-11-23 02:18:06,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:18:06,243 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-23 02:18:06,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:06,245 INFO L225 Difference]: With dead ends: 27 [2021-11-23 02:18:06,245 INFO L226 Difference]: Without dead ends: 19 [2021-11-23 02:18:06,246 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:18:06,249 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:06,253 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 5 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:18:06,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-23 02:18:06,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-23 02:18:06,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:06,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 25 transitions. [2021-11-23 02:18:06,272 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 25 transitions. Word has length 12 [2021-11-23 02:18:06,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:06,273 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 25 transitions. [2021-11-23 02:18:06,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:06,276 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 25 transitions. [2021-11-23 02:18:06,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-23 02:18:06,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:06,279 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:06,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:18:06,281 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:06,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:06,282 INFO L85 PathProgramCache]: Analyzing trace with hash 958119109, now seen corresponding path program 1 times [2021-11-23 02:18:06,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:06,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675529980] [2021-11-23 02:18:06,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:06,285 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:06,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:06,433 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:18:06,434 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:06,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675529980] [2021-11-23 02:18:06,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675529980] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:06,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014804871] [2021-11-23 02:18:06,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:06,435 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:06,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:06,445 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:06,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:18:06,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:06,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:18:06,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:06,677 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:18:06,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:06,788 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:18:06,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1014804871] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:06,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1691487727] [2021-11-23 02:18:06,815 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:18:06,816 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:06,822 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:06,829 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:06,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:07,068 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:18:07,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:18:07,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:18:07,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:18:07,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:07,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:07,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:07,474 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:18:07,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:18:07,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:18:08,151 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:08,595 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '278#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:18:08,595 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:18:08,596 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:18:08,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-23 02:18:08,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733887507] [2021-11-23 02:18:08,596 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:18:08,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:18:08,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:08,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:18:08,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:18:08,599 INFO L87 Difference]: Start difference. First operand 19 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:08,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:08,687 INFO L93 Difference]: Finished difference Result 35 states and 47 transitions. [2021-11-23 02:18:08,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:18:08,688 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-23 02:18:08,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:08,691 INFO L225 Difference]: With dead ends: 35 [2021-11-23 02:18:08,691 INFO L226 Difference]: Without dead ends: 20 [2021-11-23 02:18:08,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 35 SyntacticMatches, 11 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:18:08,699 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:08,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:18:08,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-23 02:18:08,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-23 02:18:08,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:08,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2021-11-23 02:18:08,713 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 18 [2021-11-23 02:18:08,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:08,713 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2021-11-23 02:18:08,714 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:08,714 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2021-11-23 02:18:08,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:18:08,715 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:08,715 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:08,761 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:08,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:08,948 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:08,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:08,948 INFO L85 PathProgramCache]: Analyzing trace with hash -1662557419, now seen corresponding path program 2 times [2021-11-23 02:18:08,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:08,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290016623] [2021-11-23 02:18:08,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:08,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:08,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:09,048 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:18:09,049 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:09,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290016623] [2021-11-23 02:18:09,049 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290016623] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:09,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1484119615] [2021-11-23 02:18:09,049 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:18:09,050 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:09,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:09,051 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:09,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:18:09,114 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:18:09,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:18:09,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:18:09,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:09,205 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:18:09,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:09,269 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 02:18:09,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1484119615] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:09,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1860576991] [2021-11-23 02:18:09,278 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:18:09,279 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:09,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:09,279 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:09,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:09,378 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:18:09,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:18:09,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:18:09,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:18:09,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:09,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:09,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:09,564 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:18:09,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:18:09,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:18:09,924 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:10,140 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '496#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:18:10,141 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:18:10,141 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:18:10,141 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-23 02:18:10,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587312023] [2021-11-23 02:18:10,142 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:18:10,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 02:18:10,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:10,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 02:18:10,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:18:10,145 INFO L87 Difference]: Start difference. First operand 20 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:10,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:10,229 INFO L93 Difference]: Finished difference Result 39 states and 55 transitions. [2021-11-23 02:18:10,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:18:10,230 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-23 02:18:10,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:10,231 INFO L225 Difference]: With dead ends: 39 [2021-11-23 02:18:10,232 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 02:18:10,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:18:10,233 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:10,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 11 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:18:10,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 02:18:10,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-23 02:18:10,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.28) internal successors, (32), 25 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:10,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-11-23 02:18:10,241 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 19 [2021-11-23 02:18:10,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:10,241 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-11-23 02:18:10,242 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:10,242 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-11-23 02:18:10,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-23 02:18:10,243 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:10,243 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:10,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:10,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:10,464 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:10,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:10,464 INFO L85 PathProgramCache]: Analyzing trace with hash 669056191, now seen corresponding path program 3 times [2021-11-23 02:18:10,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:10,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082549738] [2021-11-23 02:18:10,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:10,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:10,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:11,750 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:18:11,751 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:11,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082549738] [2021-11-23 02:18:11,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082549738] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:11,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475557438] [2021-11-23 02:18:11,751 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:18:11,751 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:11,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:11,755 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:11,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:18:11,822 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:18:11,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:18:11,852 WARN L261 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-23 02:18:11,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:12,762 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:18:12,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:13,933 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-23 02:18:13,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 51 [2021-11-23 02:18:14,072 INFO L354 Elim1Store]: treesize reduction 73, result has 11.0 percent of original size [2021-11-23 02:18:14,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 18 [2021-11-23 02:18:14,154 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 02:18:14,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1475557438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:14,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1934696013] [2021-11-23 02:18:14,157 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:18:14,157 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:14,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:14,158 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:14,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:14,242 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:18:14,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:18:14,294 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:18:14,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:18:14,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:18:14,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:14,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:14,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:14,445 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:18:14,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:18:14,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:18:14,789 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:16,068 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '811#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:18:16,068 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:18:16,068 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:18:16,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 19] total 49 [2021-11-23 02:18:16,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239315711] [2021-11-23 02:18:16,069 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:18:16,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-23 02:18:16,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:16,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-23 02:18:16,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=2687, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 02:18:16,073 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 49 states, 49 states have (on average 1.3673469387755102) internal successors, (67), 49 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:17,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:17,225 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2021-11-23 02:18:17,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:18:17,226 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.3673469387755102) internal successors, (67), 49 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-23 02:18:17,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:17,227 INFO L225 Difference]: With dead ends: 45 [2021-11-23 02:18:17,227 INFO L226 Difference]: Without dead ends: 42 [2021-11-23 02:18:17,230 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 26 SyntacticMatches, 19 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1374 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=212, Invalid=3448, Unknown=0, NotChecked=0, Total=3660 [2021-11-23 02:18:17,231 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 964 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 972 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 964 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:17,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 67 Invalid, 972 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 964 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:18:17,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-23 02:18:17,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-11-23 02:18:17,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:17,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 51 transitions. [2021-11-23 02:18:17,241 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 51 transitions. Word has length 25 [2021-11-23 02:18:17,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:17,241 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 51 transitions. [2021-11-23 02:18:17,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.3673469387755102) internal successors, (67), 49 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:17,242 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 51 transitions. [2021-11-23 02:18:17,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 02:18:17,243 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:17,243 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:17,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:17,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:17,468 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:17,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:17,468 INFO L85 PathProgramCache]: Analyzing trace with hash 294022802, now seen corresponding path program 4 times [2021-11-23 02:18:17,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:17,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4068057] [2021-11-23 02:18:17,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:17,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:17,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:17,541 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:18:17,541 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:17,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4068057] [2021-11-23 02:18:17,542 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [4068057] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:17,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970159747] [2021-11-23 02:18:17,542 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:18:17,542 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:17,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:17,555 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:17,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:18:17,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:17,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:18:17,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:17,724 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:18:17,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:17,784 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:18:17,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970159747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:17,785 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [96518088] [2021-11-23 02:18:17,788 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:18:17,788 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:17,788 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:17,789 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:17,789 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:17,845 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:18:17,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:18:17,906 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:18:17,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:18:17,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:18:18,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:18,021 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:18:18,064 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:18:18,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:18:18,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:18:18,407 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:18,835 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1150#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:18:18,835 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:18:18,835 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:18:18,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-23 02:18:18,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142400623] [2021-11-23 02:18:18,835 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:18:18,836 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:18:18,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:18,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:18:18,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:18:18,837 INFO L87 Difference]: Start difference. First operand 40 states and 51 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:19,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:19,054 INFO L93 Difference]: Finished difference Result 88 states and 113 transitions. [2021-11-23 02:18:19,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:18:19,054 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-23 02:18:19,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:19,055 INFO L225 Difference]: With dead ends: 88 [2021-11-23 02:18:19,055 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 02:18:19,056 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 53 SyntacticMatches, 15 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:18:19,057 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:19,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 15 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:18:19,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 02:18:19,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2021-11-23 02:18:19,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.255813953488372) internal successors, (54), 43 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:19,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2021-11-23 02:18:19,067 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 26 [2021-11-23 02:18:19,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:19,068 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2021-11-23 02:18:19,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:19,068 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2021-11-23 02:18:19,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 02:18:19,070 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:19,070 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:19,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:19,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 02:18:19,283 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:19,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:19,284 INFO L85 PathProgramCache]: Analyzing trace with hash 799982818, now seen corresponding path program 5 times [2021-11-23 02:18:19,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:19,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886382115] [2021-11-23 02:18:19,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:19,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:19,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:19,384 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:18:19,384 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:19,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886382115] [2021-11-23 02:18:19,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886382115] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:19,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019606818] [2021-11-23 02:18:19,385 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:18:19,385 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:19,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:19,386 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:19,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:18:19,462 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:18:19,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:18:19,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:18:19,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:19,556 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:18:19,557 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:19,657 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:18:19,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019606818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:19,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [60976661] [2021-11-23 02:18:19,660 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:18:19,661 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:19,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:19,662 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:19,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:19,735 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:18:19,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:18:19,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:18:19,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:18:19,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:19,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:19,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:19,853 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:18:19,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:18:19,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:18:20,107 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:20,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1576#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:18:20,281 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:18:20,281 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:18:20,281 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-23 02:18:20,281 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037177586] [2021-11-23 02:18:20,281 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:18:20,282 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 02:18:20,282 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:20,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 02:18:20,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:18:20,283 INFO L87 Difference]: Start difference. First operand 44 states and 54 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:20,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:20,477 INFO L93 Difference]: Finished difference Result 48 states and 58 transitions. [2021-11-23 02:18:20,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:18:20,478 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-23 02:18:20,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:20,478 INFO L225 Difference]: With dead ends: 48 [2021-11-23 02:18:20,478 INFO L226 Difference]: Without dead ends: 33 [2021-11-23 02:18:20,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:18:20,480 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:20,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 11 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:18:20,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-23 02:18:20,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-23 02:18:20,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:20,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-11-23 02:18:20,487 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 27 [2021-11-23 02:18:20,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:20,488 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-11-23 02:18:20,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:20,488 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-11-23 02:18:20,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 02:18:20,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:20,489 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:20,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:20,699 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 02:18:20,700 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:20,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:20,700 INFO L85 PathProgramCache]: Analyzing trace with hash -760189627, now seen corresponding path program 6 times [2021-11-23 02:18:20,700 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:20,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242760873] [2021-11-23 02:18:20,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:20,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:20,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:22,891 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:18:22,891 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:22,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242760873] [2021-11-23 02:18:22,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [242760873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:22,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018239048] [2021-11-23 02:18:22,891 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:18:22,891 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:22,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:22,892 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:22,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:18:22,961 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:18:22,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:18:22,964 WARN L261 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-23 02:18:22,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:24,470 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:18:24,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:26,611 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-23 02:18:26,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-11-23 02:18:26,911 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-23 02:18:26,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-11-23 02:18:26,994 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:18:26,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018239048] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:26,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [392916268] [2021-11-23 02:18:26,997 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:18:26,997 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:26,997 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:26,998 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:26,998 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:27,069 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:18:27,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:18:27,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:18:27,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:18:27,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:27,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:27,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:27,187 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:18:27,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:18:27,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:18:27,445 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:29,332 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1998#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:18:29,333 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:18:29,333 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:18:29,333 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 25, 25] total 72 [2021-11-23 02:18:29,333 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789845983] [2021-11-23 02:18:29,333 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:18:29,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-23 02:18:29,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:29,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-23 02:18:29,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=5612, Unknown=0, NotChecked=0, Total=5852 [2021-11-23 02:18:29,356 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 72 states, 72 states have (on average 1.1944444444444444) internal successors, (86), 72 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:33,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:33,061 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2021-11-23 02:18:33,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 02:18:33,062 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 1.1944444444444444) internal successors, (86), 72 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-23 02:18:33,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:33,063 INFO L225 Difference]: With dead ends: 65 [2021-11-23 02:18:33,063 INFO L226 Difference]: Without dead ends: 62 [2021-11-23 02:18:33,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 26 SyntacticMatches, 24 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3192 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=467, Invalid=10039, Unknown=0, NotChecked=0, Total=10506 [2021-11-23 02:18:33,068 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 1698 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 1783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 1698 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:33,068 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 178 Invalid, 1783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 1698 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 02:18:33,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-23 02:18:33,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 51. [2021-11-23 02:18:33,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.24) internal successors, (62), 50 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:33,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 62 transitions. [2021-11-23 02:18:33,078 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 62 transitions. Word has length 32 [2021-11-23 02:18:33,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:33,078 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 62 transitions. [2021-11-23 02:18:33,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 1.1944444444444444) internal successors, (86), 72 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:33,079 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 62 transitions. [2021-11-23 02:18:33,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 02:18:33,080 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:33,080 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:33,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:33,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:33,287 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:33,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:33,288 INFO L85 PathProgramCache]: Analyzing trace with hash 1650537336, now seen corresponding path program 7 times [2021-11-23 02:18:33,288 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:33,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857542259] [2021-11-23 02:18:33,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:33,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:33,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:33,370 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:18:33,370 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:33,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857542259] [2021-11-23 02:18:33,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857542259] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:33,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641213355] [2021-11-23 02:18:33,372 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:18:33,372 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:33,372 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:33,373 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:33,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:18:33,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:33,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:18:33,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:33,515 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:18:33,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:33,600 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:18:33,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641213355] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:33,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [481040995] [2021-11-23 02:18:33,604 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:18:33,605 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:33,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:33,605 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:33,606 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:33,659 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:18:33,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:18:33,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:18:33,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:18:33,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:33,745 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:18:33,762 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:18:33,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:18:33,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:18:34,041 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:34,520 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2479#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:18:34,520 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:18:34,520 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:18:34,520 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2021-11-23 02:18:34,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084989432] [2021-11-23 02:18:34,524 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:18:34,524 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 02:18:34,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:34,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 02:18:34,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:18:34,527 INFO L87 Difference]: Start difference. First operand 51 states and 62 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:34,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:34,731 INFO L93 Difference]: Finished difference Result 110 states and 135 transitions. [2021-11-23 02:18:34,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:18:34,731 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-23 02:18:34,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:34,732 INFO L225 Difference]: With dead ends: 110 [2021-11-23 02:18:34,732 INFO L226 Difference]: Without dead ends: 62 [2021-11-23 02:18:34,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 68 SyntacticMatches, 20 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:18:34,733 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 21 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 126 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 126 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:34,733 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 21 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [126 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:18:34,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-23 02:18:34,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 55. [2021-11-23 02:18:34,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2037037037037037) internal successors, (65), 54 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:34,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 65 transitions. [2021-11-23 02:18:34,743 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 65 transitions. Word has length 33 [2021-11-23 02:18:34,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:34,743 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 65 transitions. [2021-11-23 02:18:34,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:34,743 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 65 transitions. [2021-11-23 02:18:34,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 02:18:34,745 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:34,745 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:34,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:34,955 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:34,955 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:34,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:34,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1565908184, now seen corresponding path program 8 times [2021-11-23 02:18:34,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:34,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480059208] [2021-11-23 02:18:34,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:34,957 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:34,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:35,050 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:18:35,050 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:35,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480059208] [2021-11-23 02:18:35,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1480059208] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:35,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307215182] [2021-11-23 02:18:35,051 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:18:35,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:35,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:35,055 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:35,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:18:35,127 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:18:35,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:18:35,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:18:35,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:35,233 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:18:35,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:35,308 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-23 02:18:35,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307215182] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:35,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1974885875] [2021-11-23 02:18:35,311 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:18:35,311 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:35,311 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:35,311 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:35,312 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:35,367 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:18:35,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:18:35,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:18:35,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:18:35,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:35,452 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:18:35,476 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:18:35,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:18:35,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:18:35,735 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:36,137 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3018#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:18:36,137 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:18:36,137 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:18:36,138 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-23 02:18:36,138 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49007402] [2021-11-23 02:18:36,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:18:36,138 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 02:18:36,138 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:36,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 02:18:36,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2021-11-23 02:18:36,139 INFO L87 Difference]: Start difference. First operand 55 states and 65 transitions. Second operand has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 17 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:36,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:36,326 INFO L93 Difference]: Finished difference Result 59 states and 69 transitions. [2021-11-23 02:18:36,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:18:36,327 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 17 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-23 02:18:36,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:36,327 INFO L225 Difference]: With dead ends: 59 [2021-11-23 02:18:36,327 INFO L226 Difference]: Without dead ends: 40 [2021-11-23 02:18:36,328 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 69 SyntacticMatches, 22 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 585 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=148, Invalid=608, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:18:36,328 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:36,329 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:18:36,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-23 02:18:36,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-23 02:18:36,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 39 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:36,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-11-23 02:18:36,335 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 34 [2021-11-23 02:18:36,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:36,335 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-11-23 02:18:36,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 17 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:36,335 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-11-23 02:18:36,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 02:18:36,336 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:36,337 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:36,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:36,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:18:36,539 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:36,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:36,540 INFO L85 PathProgramCache]: Analyzing trace with hash 110673983, now seen corresponding path program 9 times [2021-11-23 02:18:36,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:36,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170608015] [2021-11-23 02:18:36,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:36,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:36,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:39,353 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 3 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:18:39,353 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:39,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170608015] [2021-11-23 02:18:39,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170608015] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:39,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311612337] [2021-11-23 02:18:39,354 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:18:39,354 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:39,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:39,355 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:39,359 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:18:39,413 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:18:39,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:18:39,415 WARN L261 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-23 02:18:39,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:41,304 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 69 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:18:41,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:44,318 INFO L354 Elim1Store]: treesize reduction 227, result has 43.3 percent of original size [2021-11-23 02:18:44,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 185 [2021-11-23 02:18:44,994 INFO L354 Elim1Store]: treesize reduction 383, result has 4.3 percent of original size [2021-11-23 02:18:44,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 30 [2021-11-23 02:18:45,090 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:18:45,090 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311612337] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:45,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [252697588] [2021-11-23 02:18:45,093 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:18:45,093 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:45,094 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:45,094 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:45,094 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:45,153 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:18:45,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:18:45,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:18:45,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:18:45,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:45,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:45,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:45,274 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:18:45,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:18:45,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:18:45,465 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:46,081 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3540#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:18:46,081 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:18:46,081 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:18:46,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 32, 31] total 92 [2021-11-23 02:18:46,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132537905] [2021-11-23 02:18:46,082 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:18:46,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-11-23 02:18:46,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:46,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-11-23 02:18:46,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=8987, Unknown=0, NotChecked=0, Total=9312 [2021-11-23 02:18:46,086 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 92 states, 92 states have (on average 1.1521739130434783) internal successors, (106), 92 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:57,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:57,326 INFO L93 Difference]: Finished difference Result 123 states and 145 transitions. [2021-11-23 02:18:57,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-11-23 02:18:57,326 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 92 states have (on average 1.1521739130434783) internal successors, (106), 92 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-23 02:18:57,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:57,328 INFO L225 Difference]: With dead ends: 123 [2021-11-23 02:18:57,328 INFO L226 Difference]: Without dead ends: 119 [2021-11-23 02:18:57,334 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 54 SyntacticMatches, 4 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5329 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=1425, Invalid=22137, Unknown=0, NotChecked=0, Total=23562 [2021-11-23 02:18:57,335 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 67 mSDsluCounter, 310 mSDsCounter, 0 mSdLazyCounter, 3323 mSolverCounterSat, 451 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 3774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 451 IncrementalHoareTripleChecker+Valid, 3323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:57,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 311 Invalid, 3774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [451 Valid, 3323 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 02:18:57,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-23 02:18:57,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 63. [2021-11-23 02:18:57,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.2096774193548387) internal successors, (75), 62 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:57,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2021-11-23 02:18:57,352 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 39 [2021-11-23 02:18:57,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:57,353 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2021-11-23 02:18:57,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 92 states have (on average 1.1521739130434783) internal successors, (106), 92 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:57,353 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2021-11-23 02:18:57,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 02:18:57,355 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:57,355 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:57,376 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:57,557 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 02:18:57,557 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:57,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:57,558 INFO L85 PathProgramCache]: Analyzing trace with hash 1890793717, now seen corresponding path program 10 times [2021-11-23 02:18:57,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:57,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352058003] [2021-11-23 02:18:57,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:57,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:57,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:57,692 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-23 02:18:57,692 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:57,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352058003] [2021-11-23 02:18:57,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352058003] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:57,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168023630] [2021-11-23 02:18:57,693 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:18:57,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:57,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:57,694 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:57,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:18:57,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:57,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:18:57,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:57,907 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-23 02:18:57,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:57,982 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-23 02:18:57,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168023630] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:57,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [43411249] [2021-11-23 02:18:57,984 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:18:57,984 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:57,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:57,984 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:57,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:58,032 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:18:58,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:18:58,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:18:58,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:18:58,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:58,135 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:18:58,154 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:18:58,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:18:58,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:18:58,379 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:18:58,574 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4265#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:18:58,575 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:18:58,575 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:18:58,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-23 02:18:58,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789538036] [2021-11-23 02:18:58,575 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:18:58,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 02:18:58,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:18:58,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 02:18:58,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:18:58,577 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:58,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:18:58,882 INFO L93 Difference]: Finished difference Result 139 states and 166 transitions. [2021-11-23 02:18:58,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:18:58,883 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-23 02:18:58,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:18:58,884 INFO L225 Difference]: With dead ends: 139 [2021-11-23 02:18:58,884 INFO L226 Difference]: Without dead ends: 63 [2021-11-23 02:18:58,885 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=185, Invalid=685, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:18:58,885 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 38 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 265 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 265 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:18:58,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 15 Invalid, 432 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [265 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:18:58,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-23 02:18:58,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 56. [2021-11-23 02:18:58,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.1636363636363636) internal successors, (64), 55 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:58,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 64 transitions. [2021-11-23 02:18:58,905 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 64 transitions. Word has length 40 [2021-11-23 02:18:58,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:18:58,906 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 64 transitions. [2021-11-23 02:18:58,906 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:18:58,906 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 64 transitions. [2021-11-23 02:18:58,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 02:18:58,911 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:18:58,911 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:18:58,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:18:59,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 02:18:59,139 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:18:59,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:18:59,140 INFO L85 PathProgramCache]: Analyzing trace with hash 1956404615, now seen corresponding path program 11 times [2021-11-23 02:18:59,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:18:59,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412955380] [2021-11-23 02:18:59,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:18:59,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:59,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:59,282 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-23 02:18:59,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:59,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412955380] [2021-11-23 02:18:59,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1412955380] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:59,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381743854] [2021-11-23 02:18:59,282 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:18:59,282 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:59,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:59,283 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:59,284 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:18:59,340 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:18:59,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:18:59,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:18:59,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:59,503 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-23 02:18:59,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:18:59,607 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-23 02:18:59,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1381743854] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:18:59,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1105016293] [2021-11-23 02:18:59,609 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:18:59,609 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:18:59,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:18:59,610 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:18:59,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:18:59,667 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:18:59,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:18:59,705 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:18:59,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:18:59,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:18:59,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:18:59,797 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:18:59,815 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:18:59,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:18:59,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:19:00,050 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:19:00,210 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4923#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:19:00,210 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:19:00,210 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:19:00,210 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-23 02:19:00,210 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367108798] [2021-11-23 02:19:00,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:19:00,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 02:19:00,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:00,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 02:19:00,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:19:00,212 INFO L87 Difference]: Start difference. First operand 56 states and 64 transitions. Second operand has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:00,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:00,451 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2021-11-23 02:19:00,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:19:00,452 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-23 02:19:00,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:00,452 INFO L225 Difference]: With dead ends: 60 [2021-11-23 02:19:00,452 INFO L226 Difference]: Without dead ends: 47 [2021-11-23 02:19:00,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 309 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=192, Invalid=800, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:19:00,456 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:00,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 13 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:19:00,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-23 02:19:00,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-23 02:19:00,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 46 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:00,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2021-11-23 02:19:00,475 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 43 [2021-11-23 02:19:00,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:00,476 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2021-11-23 02:19:00,476 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:00,476 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2021-11-23 02:19:00,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 02:19:00,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:00,476 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:19:00,501 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:19:00,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:19:00,677 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:00,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:00,677 INFO L85 PathProgramCache]: Analyzing trace with hash -1756344891, now seen corresponding path program 12 times [2021-11-23 02:19:00,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:00,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701956830] [2021-11-23 02:19:00,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:00,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:00,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:03,890 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 1 proven. 104 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:19:03,892 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:03,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701956830] [2021-11-23 02:19:03,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [701956830] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:19:03,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72421274] [2021-11-23 02:19:03,892 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:19:03,892 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:03,892 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:19:03,893 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:19:03,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:19:03,946 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:19:03,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:19:03,949 WARN L261 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 137 conjunts are in the unsatisfiable core [2021-11-23 02:19:03,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:19:06,833 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:19:06,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:19:11,444 INFO L354 Elim1Store]: treesize reduction 378, result has 41.8 percent of original size [2021-11-23 02:19:11,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 285 [2021-11-23 02:19:12,826 INFO L354 Elim1Store]: treesize reduction 628, result has 3.2 percent of original size [2021-11-23 02:19:12,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 36 [2021-11-23 02:19:12,948 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:19:12,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72421274] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:19:12,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [317623571] [2021-11-23 02:19:12,950 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:19:12,951 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:19:12,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:19:12,951 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:19:12,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:19:13,006 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:19:13,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:19:13,046 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:19:13,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:19:13,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:19:13,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:19:13,134 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:19:13,155 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:19:13,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:19:13,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:19:13,403 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:19:14,131 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5530#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:19:14,131 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:19:14,131 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:19:14,131 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 39, 37] total 112 [2021-11-23 02:19:14,131 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419238686] [2021-11-23 02:19:14,131 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:19:14,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2021-11-23 02:19:14,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:14,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2021-11-23 02:19:14,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=13166, Unknown=0, NotChecked=0, Total=13572 [2021-11-23 02:19:14,133 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 112 states, 112 states have (on average 1.125) internal successors, (126), 112 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:22,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:22,204 INFO L93 Difference]: Finished difference Result 89 states and 104 transitions. [2021-11-23 02:19:22,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-23 02:19:22,205 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 1.125) internal successors, (126), 112 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-23 02:19:22,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:22,206 INFO L225 Difference]: With dead ends: 89 [2021-11-23 02:19:22,206 INFO L226 Difference]: Without dead ends: 86 [2021-11-23 02:19:22,208 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 62 SyntacticMatches, 4 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5400 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=803, Invalid=23067, Unknown=0, NotChecked=0, Total=23870 [2021-11-23 02:19:22,208 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 10 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 3526 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 3660 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 3526 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:22,208 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 274 Invalid, 3660 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 3526 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 02:19:22,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-23 02:19:22,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 73. [2021-11-23 02:19:22,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.1666666666666667) internal successors, (84), 72 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:22,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 84 transitions. [2021-11-23 02:19:22,228 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 84 transitions. Word has length 46 [2021-11-23 02:19:22,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:22,228 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 84 transitions. [2021-11-23 02:19:22,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 112 states have (on average 1.125) internal successors, (126), 112 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:22,229 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 84 transitions. [2021-11-23 02:19:22,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 02:19:22,230 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:22,230 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:19:22,254 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:19:22,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:22,439 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:22,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:22,440 INFO L85 PathProgramCache]: Analyzing trace with hash 1616055160, now seen corresponding path program 13 times [2021-11-23 02:19:22,440 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:22,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964998088] [2021-11-23 02:19:22,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:22,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:22,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:22,575 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-23 02:19:22,575 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:22,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964998088] [2021-11-23 02:19:22,576 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [964998088] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:19:22,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711115582] [2021-11-23 02:19:22,576 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:19:22,577 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:22,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:19:22,579 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:19:22,595 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:19:22,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:22,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:19:22,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:19:22,839 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-23 02:19:22,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:19:22,961 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-23 02:19:22,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711115582] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:19:22,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2130011972] [2021-11-23 02:19:22,963 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:19:22,964 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:19:22,964 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:19:22,964 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:19:22,964 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:19:23,019 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:19:23,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:19:23,069 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:19:23,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:19:23,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:19:23,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:19:23,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:19:23,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:19:23,172 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:19:23,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:19:23,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:19:23,369 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:19:23,574 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6217#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:19:23,574 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:19:23,574 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:19:23,574 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2021-11-23 02:19:23,574 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212371474] [2021-11-23 02:19:23,574 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:19:23,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 02:19:23,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:23,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 02:19:23,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=554, Unknown=0, NotChecked=0, Total=702 [2021-11-23 02:19:23,575 INFO L87 Difference]: Start difference. First operand 73 states and 84 transitions. Second operand has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:23,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:23,846 INFO L93 Difference]: Finished difference Result 154 states and 179 transitions. [2021-11-23 02:19:23,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 02:19:23,846 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-23 02:19:23,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:23,847 INFO L225 Difference]: With dead ends: 154 [2021-11-23 02:19:23,847 INFO L226 Difference]: Without dead ends: 84 [2021-11-23 02:19:23,847 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=223, Invalid=833, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 02:19:23,848 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 227 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 227 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:23,849 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 15 Invalid, 463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [227 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:19:23,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-23 02:19:23,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 77. [2021-11-23 02:19:23,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.144736842105263) internal successors, (87), 76 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:23,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 87 transitions. [2021-11-23 02:19:23,866 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 87 transitions. Word has length 47 [2021-11-23 02:19:23,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:23,867 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 87 transitions. [2021-11-23 02:19:23,867 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.7272727272727273) internal successors, (38), 22 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:23,867 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 87 transitions. [2021-11-23 02:19:23,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 02:19:23,868 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:23,868 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:19:23,892 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:19:24,068 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:24,069 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:24,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:24,069 INFO L85 PathProgramCache]: Analyzing trace with hash 564578088, now seen corresponding path program 14 times [2021-11-23 02:19:24,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:24,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40664660] [2021-11-23 02:19:24,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:24,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:24,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:24,206 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 02:19:24,206 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:24,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40664660] [2021-11-23 02:19:24,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40664660] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:19:24,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841447142] [2021-11-23 02:19:24,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:19:24,207 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:24,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:19:24,208 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:19:24,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:19:24,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:19:24,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:19:24,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:19:24,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:19:24,509 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 02:19:24,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:19:24,623 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 02:19:24,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841447142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:19:24,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [526475098] [2021-11-23 02:19:24,625 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:19:24,626 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:19:24,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:19:24,626 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:19:24,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:19:24,684 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:19:24,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:19:24,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:19:24,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:19:24,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:19:24,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:19:24,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:19:24,785 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:19:24,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:19:24,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:19:24,968 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:19:25,111 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6982#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:19:25,111 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:19:25,111 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:19:25,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-23 02:19:25,112 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249243963] [2021-11-23 02:19:25,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:19:25,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 02:19:25,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:25,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 02:19:25,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=605, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:19:25,113 INFO L87 Difference]: Start difference. First operand 77 states and 87 transitions. Second operand has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:25,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:25,413 INFO L93 Difference]: Finished difference Result 81 states and 91 transitions. [2021-11-23 02:19:25,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 02:19:25,413 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-23 02:19:25,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:25,414 INFO L225 Difference]: With dead ends: 81 [2021-11-23 02:19:25,414 INFO L226 Difference]: Without dead ends: 54 [2021-11-23 02:19:25,414 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=243, Invalid=1017, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 02:19:25,415 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:25,415 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 13 Invalid, 509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:19:25,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-23 02:19:25,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-11-23 02:19:25,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:25,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 60 transitions. [2021-11-23 02:19:25,424 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 60 transitions. Word has length 48 [2021-11-23 02:19:25,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:25,424 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 60 transitions. [2021-11-23 02:19:25,424 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:19:25,425 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 60 transitions. [2021-11-23 02:19:25,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 02:19:25,425 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:25,426 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:19:25,448 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:19:25,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:19:25,631 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:25,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:25,632 INFO L85 PathProgramCache]: Analyzing trace with hash -1094429761, now seen corresponding path program 15 times [2021-11-23 02:19:25,632 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:25,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234885496] [2021-11-23 02:19:25,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:25,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:19:25,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:19:30,285 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 12 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:19:30,285 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:19:30,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234885496] [2021-11-23 02:19:30,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234885496] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:19:30,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098220633] [2021-11-23 02:19:30,286 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:19:30,286 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:30,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:19:30,286 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:19:30,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:19:30,345 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:19:30,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:19:30,348 WARN L261 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 163 conjunts are in the unsatisfiable core [2021-11-23 02:19:30,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:19:34,128 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 146 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:19:34,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:19:40,023 INFO L354 Elim1Store]: treesize reduction 567, result has 40.8 percent of original size [2021-11-23 02:19:40,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2021-11-23 02:19:42,977 INFO L354 Elim1Store]: treesize reduction 933, result has 2.6 percent of original size [2021-11-23 02:19:42,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2021-11-23 02:19:43,146 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 02:19:43,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098220633] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:19:43,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [893274992] [2021-11-23 02:19:43,148 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:19:43,149 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:19:43,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:19:43,151 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:19:43,152 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:19:43,216 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:19:43,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:19:43,269 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:19:43,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:19:43,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:19:43,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:19:43,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:19:43,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:19:43,358 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:19:43,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:19:43,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:19:43,512 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:19:44,246 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7704#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:19:44,246 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:19:44,247 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:19:44,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 46, 43] total 132 [2021-11-23 02:19:44,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320819414] [2021-11-23 02:19:44,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:19:44,247 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2021-11-23 02:19:44,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:44,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2021-11-23 02:19:44,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=523, Invalid=18109, Unknown=0, NotChecked=0, Total=18632 [2021-11-23 02:19:44,250 INFO L87 Difference]: Start difference. First operand 54 states and 60 transitions. Second operand has 132 states, 132 states have (on average 1.106060606060606) internal successors, (146), 132 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:05,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:05,482 INFO L93 Difference]: Finished difference Result 127 states and 148 transitions. [2021-11-23 02:20:05,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-11-23 02:20:05,482 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 1.106060606060606) internal successors, (146), 132 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-23 02:20:05,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:05,483 INFO L225 Difference]: With dead ends: 127 [2021-11-23 02:20:05,483 INFO L226 Difference]: Without dead ends: 123 [2021-11-23 02:20:05,485 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 70 SyntacticMatches, 4 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13161 ImplicationChecksByTransitivity, 28.0s TimeCoverageRelationStatistics Valid=2072, Invalid=42660, Unknown=0, NotChecked=0, Total=44732 [2021-11-23 02:20:05,485 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 98 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 6070 mSolverCounterSat, 833 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 281 SdHoareTripleChecker+Invalid, 6903 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 833 IncrementalHoareTripleChecker+Valid, 6070 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:05,485 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 281 Invalid, 6903 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [833 Valid, 6070 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2021-11-23 02:20:05,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-23 02:20:05,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 70. [2021-11-23 02:20:05,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.144927536231884) internal successors, (79), 69 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:05,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 79 transitions. [2021-11-23 02:20:05,503 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 79 transitions. Word has length 53 [2021-11-23 02:20:05,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:20:05,503 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 79 transitions. [2021-11-23 02:20:05,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 1.106060606060606) internal successors, (146), 132 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:05,504 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 79 transitions. [2021-11-23 02:20:05,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 02:20:05,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:20:05,504 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:20:05,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:20:05,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 02:20:05,705 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:20:05,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:20:05,705 INFO L85 PathProgramCache]: Analyzing trace with hash 432234194, now seen corresponding path program 16 times [2021-11-23 02:20:05,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:20:05,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076413942] [2021-11-23 02:20:05,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:05,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:20:05,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:05,854 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 02:20:05,854 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:20:05,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076413942] [2021-11-23 02:20:05,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2076413942] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:20:05,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1157380740] [2021-11-23 02:20:05,855 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:20:05,855 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:20:05,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:20:05,856 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:20:05,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:20:05,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:05,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:20:05,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:20:06,134 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 02:20:06,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:20:06,241 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-23 02:20:06,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1157380740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:20:06,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [523929556] [2021-11-23 02:20:06,243 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:20:06,243 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:20:06,244 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:20:06,244 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:20:06,244 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:20:06,287 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:20:06,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:20:06,324 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:20:06,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:20:06,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:20:06,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:20:06,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:20:06,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:20:06,394 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:20:06,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:20:06,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:20:06,543 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:20:06,711 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8580#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:20:06,712 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:20:06,712 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:20:06,712 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-23 02:20:06,712 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307426642] [2021-11-23 02:20:06,712 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:20:06,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 02:20:06,713 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:20:06,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 02:20:06,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=737, Unknown=0, NotChecked=0, Total=930 [2021-11-23 02:20:06,713 INFO L87 Difference]: Start difference. First operand 70 states and 79 transitions. Second operand has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:07,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:07,047 INFO L93 Difference]: Finished difference Result 178 states and 204 transitions. [2021-11-23 02:20:07,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 02:20:07,047 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-23 02:20:07,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:07,048 INFO L225 Difference]: With dead ends: 178 [2021-11-23 02:20:07,048 INFO L226 Difference]: Without dead ends: 81 [2021-11-23 02:20:07,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=298, Invalid=1108, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 02:20:07,049 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 382 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 382 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:07,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 17 Invalid, 618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [382 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:20:07,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-23 02:20:07,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 74. [2021-11-23 02:20:07,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.1232876712328768) internal successors, (82), 73 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:07,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 82 transitions. [2021-11-23 02:20:07,067 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 82 transitions. Word has length 54 [2021-11-23 02:20:07,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:20:07,068 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 82 transitions. [2021-11-23 02:20:07,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:07,068 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 82 transitions. [2021-11-23 02:20:07,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 02:20:07,068 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:20:07,068 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:20:07,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:20:07,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:20:07,271 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:20:07,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:20:07,272 INFO L85 PathProgramCache]: Analyzing trace with hash -952453241, now seen corresponding path program 17 times [2021-11-23 02:20:07,272 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:20:07,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1296683744] [2021-11-23 02:20:07,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:07,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:20:07,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:07,415 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-11-23 02:20:07,415 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:20:07,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1296683744] [2021-11-23 02:20:07,416 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1296683744] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:20:07,416 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363861438] [2021-11-23 02:20:07,416 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:20:07,416 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:20:07,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:20:07,417 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:20:07,443 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 02:20:07,531 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 02:20:07,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:20:07,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:20:07,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:20:07,772 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-11-23 02:20:07,772 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:20:07,896 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-11-23 02:20:07,896 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1363861438] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:20:07,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1514618395] [2021-11-23 02:20:07,897 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:20:07,897 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:20:07,898 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:20:07,898 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:20:07,898 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:20:07,946 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:20:07,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:20:07,989 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:20:07,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:20:08,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:20:08,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:20:08,044 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:20:08,062 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:20:08,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:20:08,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:20:08,242 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:20:08,923 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9446#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:20:08,923 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:20:08,923 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:20:08,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-23 02:20:08,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401658465] [2021-11-23 02:20:08,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:20:08,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-23 02:20:08,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:20:08,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-23 02:20:08,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2021-11-23 02:20:08,925 INFO L87 Difference]: Start difference. First operand 74 states and 82 transitions. Second operand has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:09,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:20:09,240 INFO L93 Difference]: Finished difference Result 78 states and 86 transitions. [2021-11-23 02:20:09,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 02:20:09,240 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2021-11-23 02:20:09,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:20:09,241 INFO L225 Difference]: With dead ends: 78 [2021-11-23 02:20:09,241 INFO L226 Difference]: Without dead ends: 61 [2021-11-23 02:20:09,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 118 SyntacticMatches, 39 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1620 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=301, Invalid=1259, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:20:09,242 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 309 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 309 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:20:09,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 13 Invalid, 658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [309 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:20:09,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-23 02:20:09,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-11-23 02:20:09,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:09,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2021-11-23 02:20:09,261 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 57 [2021-11-23 02:20:09,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:20:09,261 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2021-11-23 02:20:09,261 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:20:09,261 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2021-11-23 02:20:09,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 02:20:09,262 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:20:09,262 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:20:09,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:20:09,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:20:09,463 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:20:09,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:20:09,463 INFO L85 PathProgramCache]: Analyzing trace with hash -465347003, now seen corresponding path program 18 times [2021-11-23 02:20:09,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:20:09,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9807691] [2021-11-23 02:20:09,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:20:09,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:20:09,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:20:15,335 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 4 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:20:15,335 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:20:15,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9807691] [2021-11-23 02:20:15,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9807691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:20:15,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683864405] [2021-11-23 02:20:15,336 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:20:15,336 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:20:15,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:20:15,337 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:20:15,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 02:20:15,401 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:20:15,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:20:15,409 WARN L261 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 189 conjunts are in the unsatisfiable core [2021-11-23 02:20:15,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:20:21,278 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 195 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:20:21,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:20:31,927 INFO L354 Elim1Store]: treesize reduction 794, result has 40.2 percent of original size [2021-11-23 02:20:31,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 552 [2021-11-23 02:20:39,991 INFO L354 Elim1Store]: treesize reduction 1298, result has 2.2 percent of original size [2021-11-23 02:20:39,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 47 [2021-11-23 02:20:40,159 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:20:40,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [683864405] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:20:40,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [323135343] [2021-11-23 02:20:40,161 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:20:40,161 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:20:40,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:20:40,162 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:20:40,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:20:40,221 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:20:40,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:20:40,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:20:40,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:20:40,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:20:40,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:20:40,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:20:40,298 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:20:40,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:20:40,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:20:40,446 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:20:41,411 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10240#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:20:41,411 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:20:41,411 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:20:41,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 53, 49] total 152 [2021-11-23 02:20:41,412 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547048423] [2021-11-23 02:20:41,412 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:20:41,412 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2021-11-23 02:20:41,412 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:20:41,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-11-23 02:20:41,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=551, Invalid=23941, Unknown=0, NotChecked=0, Total=24492 [2021-11-23 02:20:41,414 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 152 states, 152 states have (on average 1.0921052631578947) internal successors, (166), 152 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:21:21,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:21:21,147 INFO L93 Difference]: Finished difference Result 232 states and 261 transitions. [2021-11-23 02:21:21,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-11-23 02:21:21,147 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 1.0921052631578947) internal successors, (166), 152 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-23 02:21:21,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:21:21,149 INFO L225 Difference]: With dead ends: 232 [2021-11-23 02:21:21,149 INFO L226 Difference]: Without dead ends: 212 [2021-11-23 02:21:21,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 78 SyntacticMatches, 4 SemanticMatches, 283 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18072 ImplicationChecksByTransitivity, 52.5s TimeCoverageRelationStatistics Valid=3318, Invalid=77622, Unknown=0, NotChecked=0, Total=80940 [2021-11-23 02:21:21,152 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 87 mSDsluCounter, 496 mSDsCounter, 0 mSdLazyCounter, 7129 mSolverCounterSat, 1058 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 499 SdHoareTripleChecker+Invalid, 8187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1058 IncrementalHoareTripleChecker+Valid, 7129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:21:21,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 499 Invalid, 8187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1058 Valid, 7129 Invalid, 0 Unknown, 0 Unchecked, 6.0s Time] [2021-11-23 02:21:21,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-11-23 02:21:21,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 105. [2021-11-23 02:21:21,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.1346153846153846) internal successors, (118), 104 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:21:21,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 118 transitions. [2021-11-23 02:21:21,182 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 118 transitions. Word has length 60 [2021-11-23 02:21:21,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:21:21,182 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 118 transitions. [2021-11-23 02:21:21,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 152 states have (on average 1.0921052631578947) internal successors, (166), 152 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:21:21,183 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 118 transitions. [2021-11-23 02:21:21,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 02:21:21,183 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:21:21,184 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:21:21,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:21:21,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:21:21,391 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:21:21,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:21:21,392 INFO L85 PathProgramCache]: Analyzing trace with hash 1830054325, now seen corresponding path program 19 times [2021-11-23 02:21:21,392 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:21:21,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033319746] [2021-11-23 02:21:21,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:21,392 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:21:21,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:21,552 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-23 02:21:21,552 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:21:21,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033319746] [2021-11-23 02:21:21,552 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033319746] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:21:21,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [992092975] [2021-11-23 02:21:21,553 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:21:21,553 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:21:21,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:21:21,553 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:21:21,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 02:21:21,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:21,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:21:21,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:21:21,914 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-23 02:21:21,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:21:22,027 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-23 02:21:22,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [992092975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:21:22,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1088253736] [2021-11-23 02:21:22,031 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:21:22,031 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:21:22,032 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:21:22,032 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:21:22,032 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:21:22,084 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:21:22,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:21:22,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:21:22,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:21:22,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:21:22,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:21:22,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:21:22,157 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:21:22,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:21:22,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:21:22,360 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:21:23,233 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11544#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:21:23,233 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:21:23,233 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:21:23,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-23 02:21:23,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28600638] [2021-11-23 02:21:23,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:21:23,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 02:21:23,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:21:23,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 02:21:23,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=889, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 02:21:23,235 INFO L87 Difference]: Start difference. First operand 105 states and 118 transitions. Second operand has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:21:23,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:21:23,622 INFO L93 Difference]: Finished difference Result 208 states and 234 transitions. [2021-11-23 02:21:23,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 02:21:23,622 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-23 02:21:23,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:21:23,623 INFO L225 Difference]: With dead ends: 208 [2021-11-23 02:21:23,623 INFO L226 Difference]: Without dead ends: 90 [2021-11-23 02:21:23,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 127 SyntacticMatches, 41 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1573 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=365, Invalid=1357, Unknown=0, NotChecked=0, Total=1722 [2021-11-23 02:21:23,624 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 36 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 391 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 391 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:21:23,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 19 Invalid, 712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [391 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:21:23,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-23 02:21:23,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 83. [2021-11-23 02:21:23,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.1097560975609757) internal successors, (91), 82 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:21:23,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 91 transitions. [2021-11-23 02:21:23,653 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 91 transitions. Word has length 61 [2021-11-23 02:21:23,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:21:23,653 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 91 transitions. [2021-11-23 02:21:23,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:21:23,653 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 91 transitions. [2021-11-23 02:21:23,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 02:21:23,654 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:21:23,654 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:21:23,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:21:23,859 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:21:23,859 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:21:23,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:21:23,860 INFO L85 PathProgramCache]: Analyzing trace with hash -2035907443, now seen corresponding path program 20 times [2021-11-23 02:21:23,860 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:21:23,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784722832] [2021-11-23 02:21:23,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:23,860 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:21:23,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:24,029 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2021-11-23 02:21:24,030 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:21:24,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784722832] [2021-11-23 02:21:24,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784722832] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:21:24,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137652329] [2021-11-23 02:21:24,030 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:21:24,030 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:21:24,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:21:24,035 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:21:24,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 02:21:24,157 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 02:21:24,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:21:24,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:21:24,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:21:24,352 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2021-11-23 02:21:24,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:21:24,456 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2021-11-23 02:21:24,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137652329] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:21:24,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1032082263] [2021-11-23 02:21:24,457 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:21:24,458 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:21:24,458 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:21:24,458 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:21:24,458 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:21:24,499 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:21:24,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:21:24,541 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:21:24,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:21:24,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:21:24,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:21:24,646 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:21:24,667 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:21:24,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:21:24,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:21:24,858 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:21:25,638 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12535#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:21:25,638 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:21:25,638 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:21:25,639 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-23 02:21:25,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256026987] [2021-11-23 02:21:25,639 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:21:25,639 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 02:21:25,639 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:21:25,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 02:21:25,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 02:21:25,640 INFO L87 Difference]: Start difference. First operand 83 states and 91 transitions. Second operand has 29 states, 29 states have (on average 2.2758620689655173) internal successors, (66), 29 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:21:26,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:21:26,009 INFO L93 Difference]: Finished difference Result 87 states and 95 transitions. [2021-11-23 02:21:26,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:21:26,010 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.2758620689655173) internal successors, (66), 29 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-23 02:21:26,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:21:26,011 INFO L225 Difference]: With dead ends: 87 [2021-11-23 02:21:26,011 INFO L226 Difference]: Without dead ends: 68 [2021-11-23 02:21:26,011 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 141 SyntacticMatches, 44 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2055 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=366, Invalid=1526, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:21:26,012 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 277 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 277 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:21:26,012 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 732 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [277 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:21:26,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-23 02:21:26,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-23 02:21:26,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 67 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:21:26,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2021-11-23 02:21:26,035 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 64 [2021-11-23 02:21:26,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:21:26,035 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2021-11-23 02:21:26,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.2758620689655173) internal successors, (66), 29 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:21:26,035 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2021-11-23 02:21:26,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 02:21:26,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:21:26,036 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:21:26,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 02:21:26,263 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-23 02:21:26,263 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:21:26,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:21:26,264 INFO L85 PathProgramCache]: Analyzing trace with hash 291223359, now seen corresponding path program 21 times [2021-11-23 02:21:26,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:21:26,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079888732] [2021-11-23 02:21:26,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:21:26,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:21:26,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:21:33,770 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 10 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:21:33,770 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:21:33,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079888732] [2021-11-23 02:21:33,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1079888732] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:21:33,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071033831] [2021-11-23 02:21:33,771 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:21:33,771 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:21:33,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:21:33,772 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:21:33,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 02:21:33,844 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:21:33,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:21:33,848 WARN L261 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 215 conjunts are in the unsatisfiable core [2021-11-23 02:21:33,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:21:41,574 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 251 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:21:41,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:21:56,176 INFO L354 Elim1Store]: treesize reduction 1059, result has 39.7 percent of original size [2021-11-23 02:21:56,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 137 treesize of output 717 [2021-11-23 02:22:05,640 INFO L354 Elim1Store]: treesize reduction 1723, result has 1.9 percent of original size [2021-11-23 02:22:05,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 16 new quantified variables, introduced 120 case distinctions, treesize of input 138 treesize of output 54 [2021-11-23 02:22:05,842 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:22:05,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1071033831] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:22:05,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1596595587] [2021-11-23 02:22:05,843 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:22:05,843 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:22:05,844 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:22:05,844 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:22:05,844 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:22:05,899 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:22:05,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:22:05,952 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:22:05,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:22:05,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:22:06,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:22:06,021 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:22:06,040 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:22:06,040 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:22:06,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:22:06,234 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:22:15,557 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13433#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:22:15,557 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:22:15,557 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:22:15,557 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 60, 55] total 172 [2021-11-23 02:22:15,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927245193] [2021-11-23 02:22:15,559 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:22:15,561 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 172 states [2021-11-23 02:22:15,561 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:22:15,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2021-11-23 02:22:15,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=30484, Unknown=0, NotChecked=0, Total=31152 [2021-11-23 02:22:15,563 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 172 states, 172 states have (on average 1.0813953488372092) internal successors, (186), 172 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:23:12,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:12,297 INFO L93 Difference]: Finished difference Result 258 states and 287 transitions. [2021-11-23 02:23:12,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 156 states. [2021-11-23 02:23:12,298 INFO L78 Accepts]: Start accepts. Automaton has has 172 states, 172 states have (on average 1.0813953488372092) internal successors, (186), 172 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2021-11-23 02:23:12,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:12,299 INFO L225 Difference]: With dead ends: 258 [2021-11-23 02:23:12,299 INFO L226 Difference]: Without dead ends: 236 [2021-11-23 02:23:12,302 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 41 SyntacticMatches, 49 SemanticMatches, 316 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28646 ImplicationChecksByTransitivity, 81.6s TimeCoverageRelationStatistics Valid=4156, Invalid=96650, Unknown=0, NotChecked=0, Total=100806 [2021-11-23 02:23:12,303 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 54 mSDsluCounter, 568 mSDsCounter, 0 mSdLazyCounter, 8866 mSolverCounterSat, 1036 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 9902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1036 IncrementalHoareTripleChecker+Valid, 8866 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:12,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 569 Invalid, 9902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1036 Valid, 8866 Invalid, 0 Unknown, 0 Unchecked, 8.1s Time] [2021-11-23 02:23:12,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-11-23 02:23:12,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 117. [2021-11-23 02:23:12,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.1206896551724137) internal successors, (130), 116 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:23:12,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 130 transitions. [2021-11-23 02:23:12,363 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 130 transitions. Word has length 67 [2021-11-23 02:23:12,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:12,363 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 130 transitions. [2021-11-23 02:23:12,363 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 172 states, 172 states have (on average 1.0813953488372092) internal successors, (186), 172 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:23:12,364 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 130 transitions. [2021-11-23 02:23:12,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 02:23:12,364 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:12,364 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:12,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 02:23:12,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-23 02:23:12,567 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:12,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:12,567 INFO L85 PathProgramCache]: Analyzing trace with hash -1641267339, now seen corresponding path program 22 times [2021-11-23 02:23:12,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:12,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956918451] [2021-11-23 02:23:12,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:12,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:12,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:12,787 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-23 02:23:12,787 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:12,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956918451] [2021-11-23 02:23:12,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956918451] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:23:12,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1042537493] [2021-11-23 02:23:12,787 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:23:12,787 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:12,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:12,789 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:23:12,813 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 02:23:12,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:12,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 02:23:12,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:23:13,231 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-23 02:23:13,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:23:13,375 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-23 02:23:13,375 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1042537493] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:23:13,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1377218144] [2021-11-23 02:23:13,377 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:23:13,377 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:23:13,377 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:23:13,377 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:23:13,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:23:13,436 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:23:13,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:23:13,489 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:23:13,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:23:13,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:23:13,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:23:13,576 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:23:13,605 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:23:13,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:23:13,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:23:13,860 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:23:14,998 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14884#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:23:14,999 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:23:14,999 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:23:14,999 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-23 02:23:14,999 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511634313] [2021-11-23 02:23:14,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:23:14,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 02:23:15,000 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:15,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 02:23:15,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=1055, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:23:15,001 INFO L87 Difference]: Start difference. First operand 117 states and 130 transitions. Second operand has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:23:15,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:15,514 INFO L93 Difference]: Finished difference Result 231 states and 257 transitions. [2021-11-23 02:23:15,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-23 02:23:15,515 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-23 02:23:15,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:15,515 INFO L225 Difference]: With dead ends: 231 [2021-11-23 02:23:15,516 INFO L226 Difference]: Without dead ends: 99 [2021-11-23 02:23:15,516 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 142 SyntacticMatches, 46 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1939 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=439, Invalid=1631, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 02:23:15,517 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 29 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 356 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 356 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:15,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 25 Invalid, 759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [356 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:23:15,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-23 02:23:15,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2021-11-23 02:23:15,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.098901098901099) internal successors, (100), 91 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:23:15,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 100 transitions. [2021-11-23 02:23:15,562 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 100 transitions. Word has length 68 [2021-11-23 02:23:15,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:15,562 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 100 transitions. [2021-11-23 02:23:15,562 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:23:15,562 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 100 transitions. [2021-11-23 02:23:15,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 02:23:15,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:15,563 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:15,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-23 02:23:15,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 02:23:15,764 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:15,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:15,764 INFO L85 PathProgramCache]: Analyzing trace with hash 388931975, now seen corresponding path program 23 times [2021-11-23 02:23:15,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:15,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671509366] [2021-11-23 02:23:15,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:15,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:15,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:16,011 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2021-11-23 02:23:16,011 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:16,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1671509366] [2021-11-23 02:23:16,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1671509366] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:23:16,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1920416402] [2021-11-23 02:23:16,011 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:23:16,011 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:16,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:16,015 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:23:16,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 02:23:16,195 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 02:23:16,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:23:16,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 02:23:16,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:23:16,505 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2021-11-23 02:23:16,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:23:16,655 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2021-11-23 02:23:16,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1920416402] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:23:16,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [502383095] [2021-11-23 02:23:16,657 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:23:16,657 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:23:16,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:23:16,658 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:23:16,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:23:16,698 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:23:16,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:23:16,737 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:23:16,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:23:16,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:23:16,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:23:16,806 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:23:16,827 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:23:16,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:23:16,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:23:17,025 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:23:17,930 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15986#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:23:17,931 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:23:17,931 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:23:17,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-23 02:23:17,931 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888116175] [2021-11-23 02:23:17,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:23:17,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 02:23:17,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:23:17,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 02:23:17,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1067, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:23:17,933 INFO L87 Difference]: Start difference. First operand 92 states and 100 transitions. Second operand has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:23:18,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:23:18,383 INFO L93 Difference]: Finished difference Result 96 states and 104 transitions. [2021-11-23 02:23:18,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 02:23:18,384 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-23 02:23:18,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:23:18,385 INFO L225 Difference]: With dead ends: 96 [2021-11-23 02:23:18,385 INFO L226 Difference]: Without dead ends: 75 [2021-11-23 02:23:18,385 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 149 SyntacticMatches, 49 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2541 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=438, Invalid=1818, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 02:23:18,386 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 455 mSolverCounterSat, 341 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 796 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 341 IncrementalHoareTripleChecker+Valid, 455 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:23:18,386 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 15 Invalid, 796 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [341 Valid, 455 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:23:18,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-23 02:23:18,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-23 02:23:18,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:23:18,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 81 transitions. [2021-11-23 02:23:18,414 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 81 transitions. Word has length 71 [2021-11-23 02:23:18,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:23:18,414 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 81 transitions. [2021-11-23 02:23:18,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:23:18,414 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 81 transitions. [2021-11-23 02:23:18,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-23 02:23:18,414 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:23:18,415 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:23:18,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-23 02:23:18,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:18,615 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:23:18,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:23:18,615 INFO L85 PathProgramCache]: Analyzing trace with hash 701603525, now seen corresponding path program 24 times [2021-11-23 02:23:18,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:23:18,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673395618] [2021-11-23 02:23:18,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:23:18,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:23:18,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:23:28,120 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 15 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:23:28,120 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:23:28,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673395618] [2021-11-23 02:23:28,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673395618] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:23:28,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [941527434] [2021-11-23 02:23:28,120 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:23:28,120 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:23:28,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:23:28,122 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:23:28,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 02:23:28,205 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:23:28,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:23:28,209 WARN L261 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 241 conjunts are in the unsatisfiable core [2021-11-23 02:23:28,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:23:36,508 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 314 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:23:36,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:23:51,687 INFO L354 Elim1Store]: treesize reduction 1362, result has 39.3 percent of original size [2021-11-23 02:23:51,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 906 [2021-11-23 02:24:09,510 INFO L354 Elim1Store]: treesize reduction 2208, result has 1.6 percent of original size [2021-11-23 02:24:09,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 59 [2021-11-23 02:24:09,712 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 02:24:09,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [941527434] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:24:09,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1012616876] [2021-11-23 02:24:09,713 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:24:09,713 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:24:09,713 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:24:09,714 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:24:09,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:24:09,759 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:24:09,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:24:09,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:24:09,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:24:09,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:24:09,845 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:24:09,864 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:24:09,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:24:09,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:24:10,073 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:24:19,433 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16973#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:24:19,434 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:24:19,434 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:24:19,434 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 67, 61] total 192 [2021-11-23 02:24:19,434 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172924226] [2021-11-23 02:24:19,434 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:24:19,435 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 192 states [2021-11-23 02:24:19,435 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:24:19,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2021-11-23 02:24:19,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1285, Invalid=37327, Unknown=0, NotChecked=0, Total=38612 [2021-11-23 02:24:19,437 INFO L87 Difference]: Start difference. First operand 75 states and 81 transitions. Second operand has 192 states, 192 states have (on average 1.0729166666666667) internal successors, (206), 192 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:25:09,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:09,353 INFO L93 Difference]: Finished difference Result 395 states and 455 transitions. [2021-11-23 02:25:09,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2021-11-23 02:25:09,353 INFO L78 Accepts]: Start accepts. Automaton has has 192 states, 192 states have (on average 1.0729166666666667) internal successors, (206), 192 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-23 02:25:09,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:09,356 INFO L225 Difference]: With dead ends: 395 [2021-11-23 02:25:09,356 INFO L226 Difference]: Without dead ends: 371 [2021-11-23 02:25:09,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 44 SyntacticMatches, 54 SemanticMatches, 332 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48172 ImplicationChecksByTransitivity, 73.3s TimeCoverageRelationStatistics Valid=5378, Invalid=105844, Unknown=0, NotChecked=0, Total=111222 [2021-11-23 02:25:09,363 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 42 mSDsluCounter, 385 mSDsCounter, 0 mSdLazyCounter, 10463 mSolverCounterSat, 1531 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 386 SdHoareTripleChecker+Invalid, 11994 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1531 IncrementalHoareTripleChecker+Valid, 10463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:09,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 386 Invalid, 11994 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1531 Valid, 10463 Invalid, 0 Unknown, 0 Unchecked, 10.3s Time] [2021-11-23 02:25:09,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2021-11-23 02:25:09,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 135. [2021-11-23 02:25:09,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 134 states have (on average 1.1492537313432836) internal successors, (154), 134 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:25:09,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 154 transitions. [2021-11-23 02:25:09,435 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 154 transitions. Word has length 74 [2021-11-23 02:25:09,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:09,435 INFO L470 AbstractCegarLoop]: Abstraction has 135 states and 154 transitions. [2021-11-23 02:25:09,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 192 states, 192 states have (on average 1.0729166666666667) internal successors, (206), 192 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:25:09,436 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 154 transitions. [2021-11-23 02:25:09,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 02:25:09,437 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:09,437 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:09,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 02:25:09,663 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:25:09,663 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:09,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:09,664 INFO L85 PathProgramCache]: Analyzing trace with hash 2074556789, now seen corresponding path program 25 times [2021-11-23 02:25:09,664 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:09,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483269962] [2021-11-23 02:25:09,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:09,664 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:09,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:09,949 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-23 02:25:09,949 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:09,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483269962] [2021-11-23 02:25:09,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [483269962] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:25:09,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822542116] [2021-11-23 02:25:09,950 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:25:09,950 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:25:09,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:25:09,951 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:25:09,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-23 02:25:10,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:10,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:25:10,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:25:10,387 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-23 02:25:10,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:25:10,530 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-23 02:25:10,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822542116] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:25:10,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [809241678] [2021-11-23 02:25:10,532 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:25:10,532 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:25:10,532 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:25:10,532 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:25:10,533 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:25:10,587 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:25:10,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:25:10,635 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:25:10,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:25:10,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:25:10,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:25:10,719 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:25:10,744 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:25:10,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:25:10,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:25:10,984 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:25:11,249 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18768#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:25:11,249 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:25:11,249 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:25:11,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2021-11-23 02:25:11,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556855678] [2021-11-23 02:25:11,250 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:25:11,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 02:25:11,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:11,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 02:25:11,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=1235, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:25:11,251 INFO L87 Difference]: Start difference. First operand 135 states and 154 transitions. Second operand has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:25:11,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:11,843 INFO L93 Difference]: Finished difference Result 348 states and 395 transitions. [2021-11-23 02:25:11,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-23 02:25:11,844 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-23 02:25:11,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:11,845 INFO L225 Difference]: With dead ends: 348 [2021-11-23 02:25:11,845 INFO L226 Difference]: Without dead ends: 155 [2021-11-23 02:25:11,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=520, Invalid=1930, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 02:25:11,846 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 28 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 467 mSolverCounterSat, 440 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 907 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 440 IncrementalHoareTripleChecker+Valid, 467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:11,846 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 19 Invalid, 907 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [440 Valid, 467 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:25:11,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-11-23 02:25:11,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 138. [2021-11-23 02:25:11,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.1240875912408759) internal successors, (154), 137 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:25:11,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 154 transitions. [2021-11-23 02:25:11,921 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 154 transitions. Word has length 75 [2021-11-23 02:25:11,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:11,922 INFO L470 AbstractCegarLoop]: Abstraction has 138 states and 154 transitions. [2021-11-23 02:25:11,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:25:11,922 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 154 transitions. [2021-11-23 02:25:11,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-23 02:25:11,922 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:11,922 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:11,943 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-23 02:25:12,123 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-23 02:25:12,123 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:12,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:12,123 INFO L85 PathProgramCache]: Analyzing trace with hash -852878451, now seen corresponding path program 26 times [2021-11-23 02:25:12,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:12,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683184880] [2021-11-23 02:25:12,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:12,124 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:12,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:12,384 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2021-11-23 02:25:12,384 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:12,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683184880] [2021-11-23 02:25:12,384 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1683184880] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:25:12,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088919921] [2021-11-23 02:25:12,384 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:25:12,385 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:25:12,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:25:12,386 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:25:12,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-23 02:25:12,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 02:25:12,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:25:12,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:25:12,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:25:12,840 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2021-11-23 02:25:12,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:25:12,984 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2021-11-23 02:25:12,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1088919921] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:25:12,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1527694405] [2021-11-23 02:25:12,986 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:25:12,986 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:25:12,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:25:12,986 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:25:12,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:25:13,034 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:25:13,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:25:13,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:25:13,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:25:13,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:25:13,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:25:13,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:25:13,108 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:25:13,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:25:13,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:25:13,271 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:25:14,278 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20243#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:25:14,278 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:25:14,278 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:25:14,278 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2021-11-23 02:25:14,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931438571] [2021-11-23 02:25:14,279 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:25:14,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-23 02:25:14,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:25:14,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-23 02:25:14,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1249, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:25:14,280 INFO L87 Difference]: Start difference. First operand 138 states and 154 transitions. Second operand has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 35 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:25:14,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:25:14,772 INFO L93 Difference]: Finished difference Result 142 states and 158 transitions. [2021-11-23 02:25:14,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-23 02:25:14,773 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 35 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2021-11-23 02:25:14,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:25:14,773 INFO L225 Difference]: With dead ends: 142 [2021-11-23 02:25:14,774 INFO L226 Difference]: Without dead ends: 109 [2021-11-23 02:25:14,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 164 SyntacticMatches, 54 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3078 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=517, Invalid=2135, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 02:25:14,775 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 327 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 937 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 327 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:25:14,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 17 Invalid, 937 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [327 Valid, 610 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:25:14,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-11-23 02:25:14,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 82. [2021-11-23 02:25:14,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.0864197530864197) internal successors, (88), 81 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:25:14,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2021-11-23 02:25:14,818 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 78 [2021-11-23 02:25:14,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:25:14,818 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2021-11-23 02:25:14,818 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 35 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:25:14,818 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2021-11-23 02:25:14,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 02:25:14,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:25:14,819 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:25:14,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-23 02:25:15,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 02:25:15,019 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:25:15,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:25:15,020 INFO L85 PathProgramCache]: Analyzing trace with hash -329848129, now seen corresponding path program 27 times [2021-11-23 02:25:15,020 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:25:15,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073026617] [2021-11-23 02:25:15,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:25:15,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:25:15,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:25:27,713 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 38 proven. 347 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:25:27,714 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:25:27,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073026617] [2021-11-23 02:25:27,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073026617] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:25:27,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697820257] [2021-11-23 02:25:27,714 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:25:27,714 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:25:27,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:25:27,716 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:25:27,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-23 02:25:27,844 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:25:27,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:25:27,849 WARN L261 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 267 conjunts are in the unsatisfiable core [2021-11-23 02:25:27,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:25:40,647 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 384 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:25:40,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:26:06,014 INFO L354 Elim1Store]: treesize reduction 1703, result has 39.0 percent of original size [2021-11-23 02:26:06,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 171 treesize of output 1115 [2021-11-23 02:26:42,638 INFO L354 Elim1Store]: treesize reduction 2753, result has 1.5 percent of original size [2021-11-23 02:26:42,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 172 treesize of output 66 [2021-11-23 02:26:42,892 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-23 02:26:42,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697820257] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:26:42,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1344928739] [2021-11-23 02:26:42,894 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:26:42,894 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:26:42,894 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:26:42,895 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:26:42,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:26:42,939 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:26:42,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:26:42,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:26:42,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:26:43,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:26:43,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:26:43,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:26:43,019 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:26:43,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:26:43,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:26:43,185 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:26:57,265 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21400#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:26:57,265 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:26:57,265 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:26:57,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 74, 67] total 212 [2021-11-23 02:26:57,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778584410] [2021-11-23 02:26:57,266 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:26:57,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 212 states [2021-11-23 02:26:57,266 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:26:57,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 212 interpolants. [2021-11-23 02:26:57,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=867, Invalid=46005, Unknown=0, NotChecked=0, Total=46872 [2021-11-23 02:26:57,269 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand has 212 states, 212 states have (on average 1.0660377358490567) internal successors, (226), 212 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:13,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:13,488 INFO L93 Difference]: Finished difference Result 273 states and 326 transitions. [2021-11-23 02:28:13,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2021-11-23 02:28:13,489 INFO L78 Accepts]: Start accepts. Automaton has has 212 states, 212 states have (on average 1.0660377358490567) internal successors, (226), 212 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2021-11-23 02:28:13,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:13,492 INFO L225 Difference]: With dead ends: 273 [2021-11-23 02:28:13,492 INFO L226 Difference]: Without dead ends: 269 [2021-11-23 02:28:13,497 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 47 SyntacticMatches, 59 SemanticMatches, 341 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39167 ImplicationChecksByTransitivity, 114.0s TimeCoverageRelationStatistics Valid=4447, Invalid=112859, Unknown=0, NotChecked=0, Total=117306 [2021-11-23 02:28:13,497 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 138 mSDsluCounter, 514 mSDsCounter, 0 mSdLazyCounter, 16140 mSolverCounterSat, 2303 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 18443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2303 IncrementalHoareTripleChecker+Valid, 16140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:13,497 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 517 Invalid, 18443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2303 Valid, 16140 Invalid, 0 Unknown, 0 Unchecked, 15.8s Time] [2021-11-23 02:28:13,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2021-11-23 02:28:13,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 134. [2021-11-23 02:28:13,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 133 states have (on average 1.1353383458646618) internal successors, (151), 133 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:13,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 151 transitions. [2021-11-23 02:28:13,590 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 151 transitions. Word has length 81 [2021-11-23 02:28:13,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:13,590 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 151 transitions. [2021-11-23 02:28:13,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 212 states, 212 states have (on average 1.0660377358490567) internal successors, (226), 212 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:13,591 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 151 transitions. [2021-11-23 02:28:13,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 02:28:13,591 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:13,591 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:13,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:13,807 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:13,807 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:13,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:13,808 INFO L85 PathProgramCache]: Analyzing trace with hash -1635538990, now seen corresponding path program 28 times [2021-11-23 02:28:13,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:13,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899314128] [2021-11-23 02:28:13,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:13,808 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:13,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:14,087 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2021-11-23 02:28:14,087 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:14,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899314128] [2021-11-23 02:28:14,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899314128] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:14,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161103335] [2021-11-23 02:28:14,088 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:28:14,088 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:14,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:14,089 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:14,105 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-23 02:28:14,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:14,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 02:28:14,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:14,629 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2021-11-23 02:28:14,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:14,810 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2021-11-23 02:28:14,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161103335] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:14,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1644248473] [2021-11-23 02:28:14,812 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:28:14,812 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:14,812 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:14,812 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:14,812 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:14,868 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:28:14,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:28:14,915 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:28:14,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:28:14,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-23 02:28:14,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:28:14,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:28:14,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:28:15,009 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-23 02:28:15,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 246 treesize of output 243 [2021-11-23 02:28:15,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:28:15,202 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:16,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22975#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:16,677 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:16,678 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:16,678 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2021-11-23 02:28:16,678 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249945688] [2021-11-23 02:28:16,678 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:16,678 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 02:28:16,678 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:16,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 02:28:16,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=377, Invalid=1429, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 02:28:16,679 INFO L87 Difference]: Start difference. First operand 134 states and 151 transitions. Second operand has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:17,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:17,357 INFO L93 Difference]: Finished difference Result 332 states and 374 transitions. [2021-11-23 02:28:17,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:28:17,363 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2021-11-23 02:28:17,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:17,364 INFO L225 Difference]: With dead ends: 332 [2021-11-23 02:28:17,364 INFO L226 Difference]: Without dead ends: 156 [2021-11-23 02:28:17,365 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 172 SyntacticMatches, 56 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2785 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=608, Invalid=2254, Unknown=0, NotChecked=0, Total=2862 [2021-11-23 02:28:17,365 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 22 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 572 mSolverCounterSat, 536 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 1108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 536 IncrementalHoareTripleChecker+Valid, 572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:17,365 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 17 Invalid, 1108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [536 Valid, 572 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:28:17,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-11-23 02:28:17,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 149. [2021-11-23 02:28:17,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.1081081081081081) internal successors, (164), 148 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:17,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 164 transitions. [2021-11-23 02:28:17,461 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 164 transitions. Word has length 82 [2021-11-23 02:28:17,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:17,462 INFO L470 AbstractCegarLoop]: Abstraction has 149 states and 164 transitions. [2021-11-23 02:28:17,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:17,462 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 164 transitions. [2021-11-23 02:28:17,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-23 02:28:17,463 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:17,463 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:17,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-23 02:28:17,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:17,665 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:17,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:17,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1775246215, now seen corresponding path program 29 times [2021-11-23 02:28:17,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:17,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724084443] [2021-11-23 02:28:17,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:17,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:17,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:17,941 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-23 02:28:17,942 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:17,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724084443] [2021-11-23 02:28:17,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724084443] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:17,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631515073] [2021-11-23 02:28:17,942 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:28:17,942 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:17,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:17,947 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:17,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-23 02:28:18,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 02:28:18,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:18,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-23 02:28:18,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:18,565 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-23 02:28:18,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:28:18,725 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-23 02:28:18,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [631515073] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:28:18,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1366372641] [2021-11-23 02:28:18,727 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:28:18,727 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:28:18,727 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:28:18,727 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:28:18,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:28:18,787 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:28:18,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:28:18,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:28:18,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:28:18,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:28:18,884 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:28:18,902 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:28:18,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244 [2021-11-23 02:28:18,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-23 02:28:19,079 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:28:19,249 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24487#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= ~SIZE~0 |ULTIMATE.start_main_~i~0#1|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:28:19,249 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:28:19,250 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:28:19,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2021-11-23 02:28:19,250 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695482023] [2021-11-23 02:28:19,250 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:28:19,250 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 02:28:19,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:28:19,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 02:28:19,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=1445, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 02:28:19,251 INFO L87 Difference]: Start difference. First operand 149 states and 164 transitions. Second operand has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 38 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:19,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:28:19,812 INFO L93 Difference]: Finished difference Result 153 states and 168 transitions. [2021-11-23 02:28:19,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-23 02:28:19,812 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 38 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-23 02:28:19,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:28:19,813 INFO L225 Difference]: With dead ends: 153 [2021-11-23 02:28:19,813 INFO L226 Difference]: Without dead ends: 117 [2021-11-23 02:28:19,814 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 236 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1044 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=603, Invalid=2477, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 02:28:19,815 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 717 mSolverCounterSat, 341 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 1058 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 341 IncrementalHoareTripleChecker+Valid, 717 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:28:19,815 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 21 Invalid, 1058 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [341 Valid, 717 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:28:19,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-23 02:28:19,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 89. [2021-11-23 02:28:19,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.0795454545454546) internal successors, (95), 88 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:19,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2021-11-23 02:28:19,905 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 85 [2021-11-23 02:28:19,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:28:19,905 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2021-11-23 02:28:19,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 38 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:28:19,905 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2021-11-23 02:28:19,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 02:28:19,905 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:28:19,906 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:28:19,929 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2021-11-23 02:28:20,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:20,106 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:28:20,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:28:20,106 INFO L85 PathProgramCache]: Analyzing trace with hash 1799556933, now seen corresponding path program 30 times [2021-11-23 02:28:20,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:28:20,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009670424] [2021-11-23 02:28:20,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:28:20,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:28:20,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:28:35,562 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 64 proven. 398 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:28:35,562 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:28:35,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009670424] [2021-11-23 02:28:35,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1009670424] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:28:35,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1184876358] [2021-11-23 02:28:35,563 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:28:35,563 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:28:35,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:28:35,563 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:28:35,566 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a4964abb-1f2e-4887-9fc7-06fa2ab4286a/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-23 02:28:35,657 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:28:35,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:28:35,662 WARN L261 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 293 conjunts are in the unsatisfiable core [2021-11-23 02:28:35,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:28:51,671 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 461 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:28:51,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:29:23,687 WARN L227 SmtUtils]: Spent 6.24s on a formula simplification. DAG size of input: 981 DAG size of output: 541 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-23 02:29:23,689 INFO L354 Elim1Store]: treesize reduction 2082, result has 38.8 percent of original size [2021-11-23 02:29:23,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 188 treesize of output 1347 [2021-11-23 02:30:36,293 INFO L354 Elim1Store]: treesize reduction 3358, result has 1.3 percent of original size [2021-11-23 02:30:36,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 189 treesize of output 72 [2021-11-23 02:30:36,669 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 396 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 02:30:36,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1184876358] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:30:36,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [698675987] [2021-11-23 02:30:36,671 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-23 02:30:36,671 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:30:36,671 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:30:36,671 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:30:36,671 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:30:36,726 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:30:36,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-23 02:30:36,777 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:30:36,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:30:36,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-23 02:30:36,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:30:36,863 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:30:36,887 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-23 02:30:36,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 241 treesize of output 244